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| Analysis on Maximum Efficiency of Wireless Power Transfer via Magnetic Resonance |
| Lu Wencheng Qiu Xiaohui Mao Xingkui |
| College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108 |
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Abstract Due to advantages of middle transmission distance, higher efficiency，wireless power transmission system via magnetic resonance is widely studied. In this paper, expression of the maximum transmission efficiency is deduced based on the mutual coupling model of wireless power transmission system via magnetic resonance. And the three elements which determine if the system can obtain the maximum transmission efficiency is pointed out, including the selection of operating frequency, power matching, load matching. By introducing the concept of strong coupling coefficient, it is derived that the strong coupling coefficient is the key physical quantity that determine the maximum transmission efficiency. A prototype is designed and created, and the correctness of the aforementioned analyses is verified.
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Published: 20 April 2015
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2015, Vol. 16 
